Constantan® Coil

Constantan® Coil (Cu 55/Ni 45), an alloy of copper and nickel, is widely used in precision temperature measurement, thermal sensing, and strain gauge applications due to its stable electrical resistance across varying temperatures. Its low temperature coefficient of resistance ensures highly accurate thermocouple readings and consistent signal output in scientific instrumentation, making it indispensable in R&D and laboratory environments. Constantan® is critical in material stress analysis, advanced electronics, and experimental physics, where precision electrical resistance is required. Additionally, its corrosion resistance and long-term stability enable reliable performance in extreme environments, including aerospace systems, high-precision electronic components, and automated industrial processes. This alloy plays a crucial role in developing temperature-sensitive sensors, ensuring long-term reliability in high-accuracy measurement systems.

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Tolerance

Properties

Reference & Citations

Health hazard/Hazardous to the ozone layer

Serious health hazard

each

Tolerances

Coil

Thickness	<0.01mm	±25%
Thickness	0.01mm - 0.05mm	±15%
Thickness	>0.05mm	±10%

Material Properties for Alloys

Mechanical Properties

Element	Value
Hardness - Brinell	100-300
Elongation at break( % )	45
Modulus of elasticity( GPa )	162
Izod impact strength( J m⁻¹ )	107
Tensile strength( MPa )	400-590

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	52
Temperature coefficient( K⁻¹ )	0.00002+/-

Thermal Properties

Element	Value
Maximum use temperature in air( C )	500
Melting point( C )	1225-1300
Thermal conductivity( W m⁻¹ K⁻¹ )	19.5@23°C
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	14.9@20-100°C